The cost per mu = 4× (75+525)+20× (15+85)+500 = 4900.

Profit = 8800-4900 = 3900.

(3) If you want to borrow X yuan from the bank,

3900×25000+x4900-8%x≥35000

Solution: x≥2 1094 yuan

And because we want to rent 25000+2 10944900≈9.4 by integer.

∴ Rent 10 mu. You need a loan when renting 10 mu: 10×4900-25000=24000.

A: Uncle Li wants to rent 10 mu and borrow 24,000 yuan.